Motor with sleeve valve



Filed Feb. 21, 192$ N VE N TOR CHARLIE SC'IMEPEER Patented June 18, 1929.

UNITED STATES PATENT OFFICE.

GHARLES SGHAEFFER, OF PARIS, FRANCE, .ASSIGNOR T SOCIETE ANONYME DES ANGIENS ETABLISSEMENTS PANHARD. 86 LEVASSON, OF PARIS, FRANCE.

MOTOR WITH SLEEVE VALVE.

Application filed February 21, 1923, Serial No. 620,438, and in France March 8, 1922.

This invention relates to motors in which the distribution is effected by means of one or two sleeve-valves sliding against a cylindrical part of the motor or head wall.

This invention has for its purpose to allow of using at same time steel sleeve valves and steel cylinders so as to have the benefit, to the largest possible extent, of the advantages offered by the use of this metal, namely with 10 referenceto lightness, resistance and possibility of reaching great rates or speeds in the operation.

The invention consists essentially in coat ing with antifriction metal, copper or any other metal capable of reducing friction, the

sleeve-valves, at least on their rubbing portions.

This new application of antifriction metals to the construction of motors of the kind specified avoids the steel against steel friction which would rapidly produce a dangerous gripping and a rapid wear of the sleevevalves on the motor walls. On the contrary, a smooth friction and a perfect tightness of the distributing parts is always obtained. When, by the time, the rubbing surfaces of the antifriction metal lining get worn, the parts are not to be thrown aside, but it will be only necessary to provide them with a new lining of antifriction metal so that they may be able to be used again, whence a great economy on the consumption of valves.

In case the piston of the motor is also made of steel, it will also be advantageous to line with anti-friction metal the sleeve-valve walls which is in contact with this piston. Consequently, according to the particular modes of distribution through sleeve valves and according as to the steel will be used for making the wall, of the cylinder, of the head, of the single valve or of both valves, of the piston, or of part only of these parts, the valves must be coated or covered with anti friction metal either on their external face, or on their internal face, or simultaneously on both faces, generally on all parts where the steel against steel friction is likely to occur.

The use of an antifriction metal liningin connection with the steel sleeve-valves in sleeve valve motors, allows one to obtain an important advantage in the manufacture.

It is well known that, under the influence of the to-and'fro motion, a somewhat large part of the oil which is used for lubl' oating the walls of sleeve-valves and cylinders ascends through the empty space existing between these walls and enters into the combustion chamber where it is uselessly burnt thereby evolving smoke and giving rise to well known inconveniences.

It has been found in practice that with sleeve-valves lined with an antifriction al-. loy or with copper or any other matter capable of reducing or improving the friction, it is possible to considerably reduce the play between the rubbing surfaces without creating any danger of gripping. Instead of a play of at least 6 hun'drcdths of a millimeter, which is for example unavoidable in the case of steel against steel friction, a play of three hundredths. of a millimeter for. example isquite sufficient when the rubbing surfaces are coated or lined with a suitable antifriction medium. Under these conditions,- the ascent of oil is reduced to a very large proportion, whence an importanteconomy of oil and the suppression of the above mentioned inconveniences.

The present invention has also for its purpose an improvement consisting in making the sleeve-valves lined of antifriction matter of such a diameter that the play existing between the rubbing surfaces can be strictly the one which is required by the relative motion of the parts, without the usual allowance which must be observed in order to avoid gripping.

Sleeve-valves of this kind can be obtained in casting the coating matter around a steel core of any suitable shape and into a mould having the required form. This process is particularly suitable in the case where the selected covering or coating matter is castiron. It is thus possible to manufacture in a simple and economical manner strong and light casings having perfect rubbing surfaces either cast-iron against cast-iron, or cast-iron against steel.

The accompanying drawing shows by way 100 of example two forms of construction of sleeve-valves made according to the present process.

Fig. 1 is a longitudinal section made along the axis of a sleeve-valve with steel core hav- 1 ing a perforated cylindrical wall.

Figure 2 is an elevation partly in section, the lining being broken away, of a sleeve valve with a core made with steel wire.

In the arrangement shown in Figure 1, the 110 core 1 is formed of a steel cylinder, of small thickness, provided with a certain number of holes 2 adapted to allow the connection of two coatings 3 and 4. This cylinder can be provided if necessary with lugs 5 for the fastening of driving parts or with any other suitable projections.

The coating is obtained in casting the antifriction matter, cast-iron for example, around the core 1 which is suitably located in a convenient mould.

The surfaces of the valve thus formed will be of course turned, bored and finished in the usual manner.

In the form of construction as shown in Figure 2, the core 1 is constituted by a web or lattice work of steel, the wires of which can be directed either parallel and at right angles with reference to the generating lines of the cylinder, or according to inclined or diagonal direction.

Of course, the invention is in no Way limited to these modes of construction which are only given here as examples.

vClaims:

1. In an internal combustion engine of the sleeve valve type, a steel sleeve valve coated with a metal adapted to reduce the friction on all surfaces liable to rub against steel surfaces such as the walls of the cylinder head or the piston.

2. A distributing sleeve valve for internal combustion engines, comprising reticulated cylindrical steel sleeve, and inner and outer coatings secured to said sleeve, said coatings being interconnected together through the reticulations of said sleeve.

3. A sleeve valve having a plurality of transverse openings therein and metallic-coatings on the interior and exterior of the sleeve valve united through bonds passing through the transverse openings, the metallic coatings having a friction co-eflicient materially less than that of steel.

4;. In combination, a cylindrical metallic element for slidable movement within a bore whose Walls are also metallic, and an exterior coating on the cylindrical element whose friction co-e'lficient is materially less than the friction co-efiicient of the metallic walls.

In testimony that I claim the foregoing as my invention, I have signed my name.

CHARLES SCHAEFFER. 

